光质对湛江等鞭金藻生长和脂肪酸组成的影响

在气升式光生物反应器中研究不同光质光影响湛江等鞭金藻的生长。结果表明，藻细胞密度的大小顺序为：红光〉白光＋红光、白光〉白光＋蓝光＋红光〉白光＋蓝光〉蓝光。蓝光下多不饱和脂肪酸百分含量最高，占总脂肪酸的50．01％。白光下总单不饱和脂肪酸和总饱和脂肪酸含量最高，占总脂肪酸的24．19％和27．46％。多不饱和脂肪酸中C18：4。．3含量最高，占总脂肪酸的20．3％-23.3％，最高值出现在蓝光下；其次为C22：6n-3（DHA），占总脂肪酸的10．2％-12．3％，在蓝光和白光＋蓝光中较高；而C18：2n-6和C18：3n-3均以红光下的为最高，分别达3．11％和8．04％。

Effects of Light Qualities on Growth and Fatty Acid Composition of Isochrysis zhanjiangensis Hu ＆ Liu

The effects of different light qualities on the growth of Isochrysis zhanjiangensis in the air-lift photobioreactor systems were studied. The results indicated that, the cell density of L zhanjiangensis showed that： red light〉 white＋red light, white light〉white＋red＋blue light〉white＋blue light〉blue light. The content of total poly-unsaturated fatty acids reached the maximal value under blue light, accounted for 50.01% of total fatty acids. The content of total mono-unsaturated fatty acids and total saturated fatty acids reached the maximal value under white light, accounted for 24.19% and 27.46% of total fatty acids. Under blue light the C18：4n-3 content was the highest in poly-unsaturated fatty acids, accounted for 20.3% to 23.3% of total fatty acids; and C22：6n-3 （DHA） content followed, accounted for 10.2% to 12.3% of total fatty acids under blue and white＋blue light; under red light C18：2n-6 and C18：3n-3 contents reached 3.11% and 8.04% respectively.